if anything has demonstrated that imperative, it's the economy right now and the tragic circumstances we're in. >> how much danger is still out there, do you think? >> we don't know. part of the problem of the lack of transparency in these markets has been we don't really know. >> the financial reform law passed by congress in the summer of 2010 did take aim at derivatives. most standard derivatives must be traded on open exchanges with more transparent pricing. and banks can no longer trade in the riskiest default swaps. they have to spin those off to trading desks to prevent them from endangering the rest of the bank. [watch ticking] up next, some extremely vulnerable victims of the great recession. >> how can you do this to cancer patients? they're dying. if we don't provide them care, their outcome is guaranteed. they're going to die. >> 60 minutes on cnbc returns. [watch ticking] ♪ [ female announcer ] almost nothing can dampen a baby's mood, when he wakes up dry in pampers. unlike other diapers, pampers has 3 absorbent layers, for up to 12 hours of protection overnight, and mo